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Remove the flywheel Permanently #767556 03/08/19 5:13 pm
Joined: Nov 2012
Posts: 333
Denis J Offline OP
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Hi all

Getting a T120 bitsa back together for off road racing and scrambles riding.

Has anyone removed a Brit twin flywheel and run it? I wanted to know if there are any issues experienced that I can not foresee. At this time it looks really straight forward.
remove > re-balance > do wheelies> get chicks

I am interested in deleting the flywheel altogether. I have been lucky enough to have done this in many a different racing disciplines from dirt bikes to sprint car racing. We added weight for road and drag racing. I appreciate the willingness for insight on the hypothesis, but I am really just interested in first hand experience. Thanks for understanding.

Did any of you find a detrimental flaw to this idea? Broken parts etc?

Thanks for your help



Bikes
- Triumph’s- BSA’s- Norton’s- Matchless’s - Scott’s- A Weslake racer...many others from all over the world.
If it has 2 wheels I might need it.
“You can wheelie any bike if you just try”
Broken Motorcycle Mechanic at The Vintage Monkey in Sacramento, CA ...Old Motorcycle Specialists
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Re: Remove the flywheel Permanently [Re: Denis J] #767562 03/08/19 5:57 pm
Joined: Aug 2001
Posts: 7,840
triton thrasher Online Content
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Quote
remove > re-balance > do wheelies> get chicks


Stall > put flywheel back in.


Amateur Loctite enthusiast.
Re: Remove the flywheel Permanently [Re: Denis J] #767599 03/08/19 11:19 pm
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Posts: 2,622
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Rohan Offline
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Some trailbikes have an external flywheel (inside covers, easy to remove)( but not british.)
I know someone who removed it, same goals.

Made it more like a 2 stroke than a 2 stroke !
10,000+ rpms at the mere flick of the wrist.

But, what TT said.
Soon as the rpms got low-ish, just stopped dead in its tracks.

It was fun while you could keep it going though....

Re: Remove the flywheel Permanently [Re: Denis J] #767603 03/08/19 11:42 pm
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wilksville Offline
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Dennis J, give it a try and report back.

kind regards Peter


'74 T140V,'83 XR1000, C&J FLATTRACKER T140,
Re: Remove the flywheel Permanently [Re: triton thrasher] #767624 03/09/19 5:07 am
Joined: Nov 2012
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Denis J Offline OP
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Originally Posted by triton thrasher
Quote
remove > re-balance > do wheelies> get chicks


Stall > put flywheel back in.


Yeah
I assumed it may be a bit frustrating. I may give it a shot to see. This is my bitsa bike. It’s well adjusted to quick tear down


Bikes
- Triumph’s- BSA’s- Norton’s- Matchless’s - Scott’s- A Weslake racer...many others from all over the world.
If it has 2 wheels I might need it.
“You can wheelie any bike if you just try”
Broken Motorcycle Mechanic at The Vintage Monkey in Sacramento, CA ...Old Motorcycle Specialists
Re: Remove the flywheel Permanently [Re: Denis J] #776959 06/20/19 8:29 pm
Joined: Dec 2002
Posts: 99
F
flyingsquirrel Offline
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Posts: 99
Years ago i had the pleasure of working on an A10 chopper, It had instant revs and vibrated insanely. Long story was the customer never came back and 30 years later I broke the engine down for parts and that the flywheel had been totally removed.


196? BSA A65 Beater
1974 Silk-Scott
1929 Scott TT Replica
1960 Francis Barnett 150
1958 Scott Red Squirrel
2001 Derbi GPR
1979 Silk 700S
1961 Matchless G3L
Re: Remove the flywheel Permanently [Re: Rohan] #776990 06/21/19 2:13 pm
Joined: May 2013
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Allan Gill Online Happy
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Originally Posted by Rohan
Some trailbikes have an external flywheel (inside covers, easy to remove)( but not british.)


The alternator is a flywheel of sorts, a friend who has a T100 rickman Matise (single carb) doesn't have an alternator on this competition MX bike, that makes quite a bit of difference to how it revs.


beerchug
Re: Remove the flywheel Permanently [Re: Denis J] #777449 06/28/19 12:20 am
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Wilfred Offline
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The chap who built the BSA Bantam 125 cc road racer I had many years ago removed the external ignition flywheel as it apparently wasn't safe to turn at anything over 5000 rpm and as it was approaching the 100mph mark with the same third gear on the three speed close ratio set as the third gear on the original three speed set, something in excess of 5000 rpm was being used. Ignition was with a 6 volt battery and a Packard ignition coil and that would last for a day of fun before the battery had to be recharged. As I was riding mostly in the dirt, I had the local machine shop make me a 10 tooth gearbox sprocket to replace the original 15 tooth one and it provided me with some fun days. The carb was one with 1 1/8 inch bore and with all the internal modifications it was fun.

Wish I still had the little beast. In those days, one bike at a time was the norm and so it got sold so I could buy the bike I needed for the next adventure.

Cheers, Wilf


"It's about the ride..."

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